Financial risk management - Summary of Derivative Contracts (Details) ton in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) ton	Dec. 31, 2016 USD ($) ton
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton	347,451	163,755
Notional amount	$ 130,069	$ 62,424
Fair Value Asset/ (Liability)	3,965	1,593
Loss/(Gain)	$ 3,336	$ (2,297)
Corn \| Futures
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton	(33)	66
Notional amount	$ (3,198)	$ 9,436
Fair Value Asset/ (Liability)	48	46
Loss/(Gain)	$ 361	$ 46
Soybean \| Futures
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton	83	120
Notional amount	$ 19,195	$ 42,330
Fair Value Asset/ (Liability)	670	(1,171)
Loss/(Gain)	$ (765)	$ (1,170)
Soybean \| Buy put
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton		14
Notional amount		$ 464
Fair Value Asset/ (Liability)		644
Loss/(Gain)		$ 181
Sugar \| Futures
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton	343,874	17,020
Notional amount	$ 121,072	$ 9,144
Fair Value Asset/ (Liability)	3,231	722
Loss/(Gain)	$ 3,808	$ 64
Sugar \| Buy put
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton		70,510
Notional amount		$ (6,734)
Fair Value Asset/ (Liability)		5,374
Loss/(Gain)		$ 352
Sugar \| Sell call
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton		54,597
Notional amount		$ 3,058
Fair Value Asset/ (Liability)		(3,219)
Loss/(Gain)		$ (105)
Sugar \| Sell put
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton	3,572	14,528
Notional amount	$ 83	$ 748
Fair Value Asset/ (Liability)	54	(763)
Loss/(Gain)	$ (30)	$ (1,625)
Ethanol \| Futures
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton		6,900
Notional amount		$ 3,978
Fair Value Asset/ (Liability)		(40)
Loss/(Gain)		$ (40)
Wheat \| Futures
Disclosure of detailed information about financial instruments [line items]
Tons of biological asset \| ton	(45)
Notional amount	$ (7,083)
Fair Value Asset/ (Liability)	(38)
Loss/(Gain)	$ (38)

Derivative Financial Assets (Liabilities), Excluding Foreign Currency

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- Definition

Tons of Biological Asset

+ References

No definition available.

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard
-URIDate 2017-03-09

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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